It is revealed in this episode that Prentiss was graduated from high school in 1989.
When Reid and the team are at the original crime scene, Reid is wearing the same clothes he wore in the pilot ("Extreme Aggressor").
It is revealed in this episode that Reid and Garcia joined the BAU in 2004.
When he sees Mr. Corbett approaching his daughter's body, Det. Jarvis asks the BAU agents if they want to "Rochambeau" for the privilege of speaking to him. "Rochambeau" is another word for the game rock-paper-scissors.
Garcia was the new girl in 2004 and Reid thought her name was "Gomez." This was the first time Morgan called her "Baby Girl."
Reid: (talking about Mr. Corbett) He was looking for closure.
Hotchner: You think he'll get some now?
Reid: I don't really think so, I mean, people's emotional lives aren't linear like that. To say that a killer's conviction - one single event - can just suddenly bring peace to a man? I don't, I just don't think it's possible.
Hotchner: I guess he has to try. I mean, when it comes right down to it what choice does he have?
Brian Matloff: (to guard) Today when my mother talked about having to choose one life, do you believe that's true?
Lidia: I don't know what you mean.
Brian Matloff: Don't you think you'd have to choose?
Morgan: Hey, what's that new tech girl's name?
Reid: Ahh...Gomez, I think.
Morgan: (to Garcia) Excuse me, Gomez... (she doesn't respond)
Morgan: Hey, baby girl!
Garcia: (looks at him over her shoulder) Baby girl?
Morgan: Forgive me, I just didn't know the real...
Garcia: I've been called worse. What can I do for you?
Det. Jarvis: A little young, aren't ya? No offense.
Reid: None taken. In fact neuroprocessing speeds reach their maximum at around age 15, so when it comes to being affected by crime scenes and other graphic visual input we're all really the same age.
Hotchner: So, what's your plan?
Cece Hillenbrand: Plan? Try him and fry him.
Garcia: (on the phone) Yes, I know what a closed adoption means. Do you know what a court order means?
Reid: (examining Prentiss' high school yearbook picture) It's remarkable. Something like this makes you question everything you thought you knew.
Garcia: Yeah. It's like the monolith in 2001.
Reid: So there was actually a time when something like this was socially acceptable?
Garcia: Oh, you're young. The eighties left a lot of people confused. This is, uh, especially sad, though.
Mr. Corbett: It's Wordsworth. "What though the radiance that was once so bright be now forever taken from thy sight, though nothing can bring back… " (he can't continue) Thanks.
Reid: (voiceover as he walks away) " …Though nothing can bring back the hour of splendour in the grass, of glory in the flower; we will grieve not, rather find strength in what remains behind."
Hotchner: "All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another." Anatole France
After the deputy is attacked by Brian Matloff, Hotch hurries down the hallway to check on her. In one shot, a second deputy is holding a compress on the injured deputy's head. In a subsequent shot, the deputy is holding her own head.
Reid: Perhaps your lack of recognition stems from a dissociative fugue suffered in adolescence...say at a Siouxsie & the Banshees concert?
Formed in 1976, Siouxsie & the Banshees was a British punk band made up of avid Sex Pistols fans Siouxsie Sioux and Steven Severin and a variety of other performers. Later dubbed "goth rock" by critics, the band spanned two decades but never strayed far from their punk roots.
Garcia: Like the monolith in 2001.
Garcia refers to the cryptic black monolith that is at the center of the film 2001: A Space Odyssey. The meaning of the film, directed and conceived by Stanley Kubrick and Arthur C. Clarke, and the black monolith in particular, have been discussed and debated since the movie's premiere in 1968.
The title of this episode is derived from Latin and means "The mind before it receives the impressions gained from experience." Tabula rasa (literally "blank slate") was first advocated by John Locke, who believed the mind of the individual was born blank, and he also emphasized the individual's freedom to author his own soul.